@mixin image-background($url) {
    background: url($url) no-repeat center center;
    background-size: 100% 100%;
    width: width($url, 3);
    height: height($url, 3);
  }
  
  @mixin img-bg ($url, $width, $height) {
    display: inline-block;
    background-image: url($url);
    background-size: 100% 100%;
    width: ($width);
    height: ($height);
  }